Thanks for the reply.
Yes, I am definitely using the correct Legacy 16.1 drivers... ;-)
I did a clean install by completely removing the previous ones and then installed the Crimson edition.
I have reported the issue to the survey link you provided. I understand that this is now considered a "legacy" product, but I would expect that at least the last driver released for it works correctly - or at least, as good as the one before it?